Snowcrash is the book that inspired Philip to create Second Life. Then he moved on to create High Fidelity, but they are now pivoting more for virtual meetings and business use it looks. One thing I kinda don't like about the new virtual worlds, they are disconnected spaces while Second Life tried to have a sense of continued space, but never seemed to get as popular as Facebook and a region can't hold more than 100 avatars at once but even 50 is a limit in some places.
I feel SL was early for it's time though, they started working on it in the late 90s and opened in 2003. High Fidelity seemed more focus on HMDs then keyboard and mouse but I feel that is still a bit early too but it's an interesting space. I have some ideas on my own too I've been thinking about exploring, but still a lot to learn and then getting funding at some point when a more solid plan.